Yasuke (variously rendered as 弥助 or 弥介, 彌助 or 彌介 in different sources.[1]) (b. c. 1555–1590) was a Samurai of African origin who served under the Japanese hegemon and warlord Oda Nobunaga in 1581 and 1582.

Professor Ronald Duncan is acknowledged as the “Father of American Ninjutsu” as well as starting the Koga Ryu movement. There was a time when Ninjutsu was not being practiced publically in this country, but Ronald Duncan was one of a few individuals who dared to seek out and study the arts of the ninja. Since then, other Ninjutsu practitioners and schools have emerged.